ASROCK B550M Pro4 mATX Motherboard

  • Supports AMD AM4 Socket Ryzen™ 3000, 3000 G-Series, 4000 G-Series, 5000 and 5000 G-Series Desktop Processors*
  • 8 Power Phase Design, Digi Power
  • Supports DDR4 4733+ (OC)
  • 1 PCIe 4.0 x16, 1 PCIe 3.0 x16, 1 PCIe 3.0 x1, 1 M.2 Key E for WiFi
  • Graphics Output Options: HDMI, DisplayPort, D-Sub
  • AMD CrossFireX™
  • 7.1 CH HD Audio (Realtek ALC1220/ALC1200 Audio Codec), Nahimic Audio
  • 6 SATA3, 1 Hyper M.2 (PCIe Gen4 x4), 1 M.2 (PCIe Gen3 x2 & SATA3)
  • 2 USB 3.2 Gen2 (Rear Type A+C), 8 USB 3.2 Gen1 (4 Front, 4 Rear)
  • Realtek Gigabit LAN

*Not compatible with AMD Athlon™ Processors

Tax included. Shipping calculated at checkout.
Product ID: 9188912005418
Vendor: ASRock
Availability : In Stock Pre order Out of stock


USB 3.2 Gen2

- Type-A Port (10 Gb/s)

- Type-C Port (10 Gb/s)

Super Alloy

- XXL Aluminum Alloy Heatsink

- Premium 50A Power Choke

- Sapphire Black PCB

- High Density Glass Fabric PCB

- 2oz Copper PCB

Steel Slot Gen4

- Enhanced durability and stability for PCIe slots

Full Coverage M.2 Heatsink

- Efficient cooling for M.2 SSDs

Hyper M.2 (PCIe Gen4x4)

- Supports high-speed PCIe Gen4x4 SSDs

POST Status Checker (PSC)

- Easy debugging with status LEDs

Full Spike Protection

- Comprehensive protection for all USB, audio, and LAN ports

Live Update & APP Shop

- Convenient software updates and downloads

CPU Support

- AMD AM4 Socket Ryzen™ 3000, 3000 G-Series, 4000 G-Series, 5000 and 5000 G-Series Desktop Processors

- Digi Power design

- 8 Power Phase design


- AMD B550


- Dual Channel DDR4 Memory Technology

- 4 x DDR4 DIMM Slots

- Supports various DDR4 speeds up to 4733+(OC) depending on the CPU/APU

- Max. capacity: 128GB

- Supports Extreme Memory Profile (XMP) memory modules

- 15μ Gold Contact in DIMM Slots


- 256Mb AMI UEFI Legal BIOS with GUI support

- Supports "Plug and Play"

- ACPI 5.1 compliance wake up events

- Supports jumperfree

- SMBIOS 2.3 support

- Voltage Multi-adjustment options


- Integrated AMD Radeon™ Vega Series Graphics in Ryzen Series APU

- DirectX 12, Pixel Shader 5.0

- Supports Triple Monitor

- Supports resolutions up to 5K (5120x2880)@120Hz

- Supports HDR and HDCP 2.3

- Supports 4K Ultra HD playback


- 7.1 CH HD Audio with Content Protection (Realtek ALC1220/ALC1200 Audio Codec)

- Premium Blu-ray Audio support

- Supports Surge Protection

- PCB Isolate Shielding

- Nahimic Audio


- PCIE x1 Gigabit LAN 10/100/1000 Mb/s (Realtek RTL8111H)

- Supports Wake-On-LAN

- Supports Lightning/ESD Protection

- Supports Energy Efficient Ethernet 802.3az

- Supports PXE


- 2 x PCI Express x16 Slots (depending on CPU/APU: Gen4 or Gen3 modes)

- 1 x PCI Express 3.0 x1 Slot

- Supports AMD Quad CrossFireX™ and CrossFireX™

- 1 x M.2 Socket (Key E) for WiFi/BT PCIe module


- 6 x SATA3 6.0 Gb/s Connectors (support RAID 0, 1, 10)

- 1 x Hyper M.2 Socket (Gen4x4 or Gen3x4 depending on CPU/APU)

- 1 x M.2 Socket (SATA3 6.0 Gb/s or Gen3 x2)


- Variety of connectors including COM Port, TPM Header, RGB LED Headers, CPU Fan Connector, etc.

- Supports up to 12V/3A, 36W LED Strip and 5V/3A, 15W LED Strip

Rear Panel I/O

- Multiple ports including USB 3.2 Gen2 Type-A/C, HDMI, DisplayPort 1.4, LAN, and audio jacks

Software and UEFI

- ASRock Motherboard Utility (A-Tuning)

- ASRock XFast LAN

- ASRock Full HD UEFI

- ASRock Instant Flash

Hardware Monitor

- Temperature Sensing for CPU and fans

- Fan Tachometer and Multi-Speed Control

- Voltage monitoring

Form Factor

- Micro ATX (9.6-in x 9.6-in, 24.4 cm x 24.4 cm)

OS Support

- Microsoft® Windows® 10 64-bit / 11 64-bit



- ErP/EuP ready


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